Hyper-Raman scattering by polaritons in fused quartz
Denisov V. N., Mavrin B. N., Podobedov V. B., Sterin Kh. E.
The first observation of volume polaritons in an amorphous substance—quartz glass—is reported. It is established that the spatial length of the optical vibrational modes is at least 1 μιτι.